Humidifier



FIG. 1 is a front elevational view of the humidifier of this design.

FIG. 2 is a top plan view of the humidifier of FIG. 1.

FIG. 3 is a side elevational view of the humidifier of FIG. 1 taken from the right side.

FIG. 4 is a rear elevational view of the humidifier of FIG. 1, wherein the broken lines are for illustrative purposes only and form no part of the claimed design.

FIG. 5 is a bottom plan view of the humidifier of FIG. 1; and,

FIG. 6 is a side elevational view of the humidifier of FIG. 1 taken from the left side. 

The ornamental design for a humidifier, as shown and described. 